Alexius J. McMullin, 36, is wanted in Washington and Hennepin counties and could face federal charges related to his alleged role in the teenager's disappearance, Volk said. He was arrested at an apartment building without incident, Volk said.

Police believe McMullin was with a 14-year-old girl who was missing for three weeks in July until she turned herself in at a Las Vegas Greyhound bus station. McMullin had dated the girl's mother.

McMullin was arrested on an extraditable Hennepin County charge of failure to register as a sex offender, Volk said.

An extradition hearing in New Mexico will determine whether and when McMullin will be brought back to Minnesota, he said.

McMullin was convicted in Washington County of sexually assaulting and threatening his ex-girlfriend at his mother's Cottage Grove home in May of 2008.

A warrant for his arrest related to that case was issued in January, as he faced revocation of his probation.

Minnesota Bureau of Apprehension records show that McMullin was convicted of robbery with a deadly weapon in Panama City, Fla., in June of 1993, according to a Washington County District Court complaint.

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The South Washington County Bulletin in Cottage Grove and the Echo Press are owned by Forum Communications Company.